Dukane Data Sheet 85100-0127 -- Amplifiers - …

1 Page 1 of 4 DATA Sheet 85100-0127 Not to be used for installation purposes. Issue 3 06-01-11 Dukane Catalog u Commercial Sound ProductsOverview1A4060, 1A4125, and 1A4250 Power AmplifiersThe Edwards Model 1A4xxx Power Amplifiers are rated at 60, 125, or 250 watts (rms), depending on the model. They mount in a standard 19-inch ( cm) wide equipment rack and can be shipped mounted in a rack. These Amplifiers can be used in sound reinforcement, general paging, and schoolcommunication systems applications. They are UL 813 , 1B3250 Power AmplifiersThe Edwards Model 1B3125 and 1B3250 Power Amplifiers provide continuous 125- or 250-watt output with the ability to automatically switch to battery operation in the event of a line volt-age reduction or power failure. The patented circuitry can switch instantly in and out of battery operation and still maintain its state-of-the-art Remote Preamplifier The Edwards Model 1A881 Remote Preamplifier is an externally powered single microphone preamplifier designed to provide a microphone input and control at locations remote from the main amplifier .

2 Model 1A881 can also be used to supply a balanced or single-ended 600 ohm line. The DC voltage required to operate the preamplifier can be supplied over one twisted pair length as long as the voltage does not drop below 18 volts. The applications for the Model 1A881 are practically unlimited, and this unit will solve many installation problems by eliminating a bulky self-pow-ered unit where a single microphone source is Bridging TransformerThe Edwards Model 3A230 Bridging Transformer has a wide frequency range, low distortion, and minimal insertion loss. Model 3A230 is a high-impedance bridging transformer used primarily for equipment Features1A4060, 1A4125, 1A4250 Power Amplifiers Broad frequency response Low distortion Dual independent electronic protection circuits Self-resetting heat sink thermal circuit breaker (1A4060, 1A4125) Self-resetting power transformer thermal circuit breaker (1A4060, 1A4125) Self-resetting thermal cutouts (1A4250)

3 1B3125, 1B3250 Power Amplifiers UL 1711 Listed and UL 813 Listed Patented 24 Vdc Battery Backup Broad Frequency Response Low Distortion Thermal Circuit Breaker Electronic Overload Protection1A881 Remote Preamplifier Excellent frequency response Less than one percent distortion, 60 to 20,000Hz at 2-volt output +8dBm across 600 Ohm line3A230 Bridging Transformer Excellent frequency response Less than percent distortion, 20 to 20,000 HzAmplifiers1A4060, 1A4125, 1A4250, 1A881, 1B3125, 1B3250and 3A230 Page 2 of 4 DATA Sheet 85100-0127 Not to be used for installation purposes. Issue 3 Engineers' Specification[1A4060] [1A4125] Power AmplifierThe power amplifier shall be Edwards Model [1A4060] [1A4125] or approved equal. It shall be capable of delivering [60] [125] watts (rms) power with less than harmonic distortion from 45Hz to 20kHz (measured at the tap, bandwidth limited 20Hz to 30kHz). The frequency response shall be 20Hz to 20kHz (+0/ 1dB) per EIA standard SE-101A.

4 The signal-to-noise ratio shall be better than 96dB below rated output for the 20Hz to 20kHz bandwidth. Input sensitivity shall be (rms) at 1kHz for rated output, and input impedance shall be 20k ohms. Output load shall be 83 ohms ( ), 10 ohms (25V), and 8 ohms (22V), and there shall be a 25V center tap. Output regulation shall be better than 1dB, no load to full rear-mounted input level control shall be provided. The ampli-fier shall have dual independent electronic protection circuits as a safeguard against damage from overloads or shorted outputs. A self-resetting thermal circuit breaker shall be provided on the heat sink to open the primary power circuit, and a self-resetting thermal circuit breaker shall be contained within the unit s power trans-former. The power source shall be 120 Vac, 60Hz. The amplifier shall draw at 120 Vac. Terminations shall be to screw terminal strips (with barriers and wire capture plates on the output strip).

5 The power amplifier shall be 5-1/4 inches ( cm) high, 19 inches ( cm) wide, and 6-1/4 inches ( cm) deep, and shall be finished in baked charcoal enamel. Net weight shall not exceed 12 pounds ( kg). The amplifier shall be UL 813 (Commercial and Sound Equipment Standard) Listed. The amplifier shall mount in any standard 19-inch ( cm) wide equipment rack and be capable of shipment while mounted in such a rack without requir-ing any additional Power AmplifierThe power amplifier shall be Edwards Model 1A4250 or approved equal. It shall be capable of delivering 250 watts (rms) power with less than harmonic distortion from 45Hz to 20kHz (mea-sured at the tap). The frequency response shall be 20Hz to 20kHz (+0/-1dB) per EIA standard SE-101A. The signal-to-noise ratio shall be better than 96dB below rated output for the 20Hz to 20kHz bandwidth. The input sensitivity shall be (rms) at 1kHz for rated output, and the input impedance shall be 20k output load shall be volts (20 ohms), 25 volts ( ohms), 8 ohms, and 4 ohms, with a 25V center tap.

6 The output regula-tion shall be better than 1dB, no load to full load. A rear mounted input level control shall be provided. The amplifier shall have dual independent electronic protection circuits as a safeguard against damage caused by overloads or shorted outputs. A self-restoring thermal circuit breaker shall be provided on the heat sink to open the output connection, and a self-resetting thermal circuit breaker shall be contained within the unit s power power source shall be 120 Vac, 60Hz. At rated output, the amplifier shall draw at 120 Vac. Terminations shall be to screw terminal strips (with barriers and wire capture plates on the output strip). The amplifier shall be 5-1/4 inches ( cm) high by 19 inches ( cm) wide and 13 inches (33 cm) deep, finished in charcoal-colored baked enamel. The net weight shall not exceed 38 pounds ( kg). The amplifier shall be UL 813 (Commercial and Sound Equipment Standard) listed.

7 The amplifier shall mount in any standard 19-inch ( cm) wide equipment rack.[1B3125] [1B3250] Power AmplifierThe power amplifier shall be Edwards Model [1B3125] [1B3250] or an approved equal. It shall be able to continuously deliver [125] [250] watts (rms) for 250 hours in accordance with UL Standard 1711. The amplifier shall be acceptable for use in fire protective signaling systems per UL 1711 and for commercial/general ap-plications per UL amplifier s normal power source shall be 120 Vac, 60Hz. The amplifier shall draw [ ] [ ] amps at 120 Vac while operating at rated output. While operating from a 24 Vdc backup power source, the amplifier shall draw [ ] [23 Adc] while providing rated output. The built-in inverter shall provide automatic transfer to bat-tery operation when the AC line voltage falls below 105 Vac (nomi-nal), and it shall automatically return to AC operation when the line voltage exceeds 105 Vac (nominal).

8 While operating from batteries, the built-in inverter shall be capable of being placed on standby to reduce battery drain with a single low-energy contact closure. The built-in inverter shall draw no current from the batteries while the amplifier is operating from the primary AC power full power response shall be 45Hz to 20kHz at rated output at THD less than or equal to measured at the tap. The frequency response shall be 20Hz to 20kHz (+0, 1dB) per EIA standard SE101-A (9dB below full output). The signal-tonoise ratio shall be better than 90dB below rated output for the 20Hz to 20kHz bandwidth, unweighted. Input sensitivity shall be 1 Vrms at 1kHz for rated output, and input impedance shall be 75k ohms. [1B3125: The amplifier s output shall be volts (with a 40-ohm load), 25 volts (with a 5-ohm load), and volts (with an 8-ohm load).][1B3250: The amplifier s output shall be volts (with a 20-ohm load), 25 volts (with a load), and volts (with an 8-ohm load).]

9 ]The amplifier shall have a 25-volt center tap. Output regulation shall be better than 1dB, no load to full amplifier shall have a 25-volt center tap. Output regulation shall be better than 1dB, no load to full amplifier shall have an electronic protection circuit as a safe-guard against damage caused by overloads or shorted outputs. A thermal overload protection circuit shall be provided on the heatsink to open the primary power circuit. It shall illuminate a thermal overload LED whenever the amplifier overheats due to an overloaded or shorted output. Both protective circuits shall be self-restoring. Both the 120 Vac and the 24 Vdc inputs shall be fused. Fuses shall be rear panel rear-mounted input level control shall be provided. Terminations shall be to screw terminal strips with barriers on the output terminals. The power amplifier shall be 5-1/4 inches ( cm) high, 19 inches ( cm) wide, and [6-5/8 inches ( cm)] [15 inches ( cm)] deep, and finished in a charcoal-colored baked enamel.

10 Net weight shall not exceed [22-1/2 pounds ( kg] [50 pounds ( kg)].1A881 Remote PreamplifierThe Remote Preamplifier shall be Edwards Model 1A881. The preamplifier shall have an output of +8dBm, gain of 60dB, and a frequency response of 20Hz to 20,000Hz 2 dB with not more than1 percent distortion. Noise level shall be less than , Rs equals 150 ohms, BW equals 20kHz. The output impedance shall be less than 150 ohms, and the load impedance shall be 600 ohms. The transistorized, plug-in printed circuit board shall operate on ex-ternally supplied 24 Vdc at 5mA. The entire assembly, including the microphone receptacle and volume control, shall be mounting on a two-gang wall box with a minimum depth of 2-1/2 inches ( cm).Page 3 of 4 DATA Sheet 85100-0127 Not to be used for installation purposes. Issue 3 1A4060 Power AmplifierPower Output60 watts (rms)Frequency Response (@ 9dB below rated output*)20Hz to 20kHz (+0/ 1dB)Power Response45Hz to 20kHz, +0/ 1dB (0dB = 60 watts), THD , 45Hz to 20kHz (bandwidth limited 20Hz to 30kHz) @ 1kHz at rated output (THD typically < )Signal-to-noise RatioBetter than 96dB below rated outputInput (rms) at 1kHz for rated outputInput Impedance20k OhmsOutputs (All fully transformer isolated) (83 Ohms) 25V (10 Ohms) balanced 25V center tap 8 Ohms (22V)Output Regulation (no load to full load voltage change)Better than 1dBControlRear panel input level controlTerminationsScrew terminal strips (w/ barriers and wire capture plates on outputs)IndicatorPower-on LEDP ower Source120 Vac, 60 HzAC Power (120 Vac) at rated output at , slow-blowFinishBaked charcoal enamelDimensions5-1/4 ( cm) high, 19 ( cm) wide, 6-1/4 ( cm))